Phoronix: An In-Kernel Virtio Block Device Accelerator For Linux

For the past several months there has been work on vhost-blk, an in-kernel virito-blk device accelerator. This kernel-based accelerator can provide measurable speed-ups for disk/block device access by virtualized guest machines...

http://www.phoronix.com/vr.php?view=MTI0MDQ